![]() But this could become a ring-around-a-rosie scenario. NOTE: I suspect that some (maybe most?) equipment automagically switchs to internal clock if there is no incoming signal, meaning in that case loops from the far would work even if this device is set to use recovered clock. In this case no matter how you loop it the clock is the same. In this case both CPE are recovering clock and using recovered for Tx. To my mind having a network clocks (which after all is a highly stable clock(strata 2 or 3)). IN this case there will be slips if the incoming data is not clocked to the same clock as the outgoing data. Most of my troubleshooting is long distance and most of my customers have no T-berd so loops to/from the CPE is the only option we have.īut keep in mind that most CPE cannot use two clocks simultaneously. In this case you would have separate clocks west and east. Now, if you wanted to test this line you could put a pair of T-berds on the line with each configured to use internal Clock for TX and recovered clock for RX. ![]() However, if we loop back site A site B will have no TX clock since its TX clock is the recovered RX clock. If we loop back site B A gets signal back and since this is synchronous to the TX clock (since it IS the TX clock) there are no clock slips. the CPE would be set to recover clock and to use recovered clock for TX. RX clock would also be from the internal clock (most equipment in my experience cannot use separate clocks for TX and RX).Īt the other end (Site B). In that case (just like a limited distance modem) one CPE (lets call it site A)would be configured for internal clock for TX. ![]() If the T1 does not go through a CO (which is a rare case)it would be unclocked. ![]()
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